SUBSTRATE HAVING SINGLE PATTERNED METAL LAYER, AND PACKAGE APPLIED WITH THE SUBSTRATE , AND METHODS OF MANUFACTURING OF THE SUBSTRATE AND PACKAGE
A substrate having single patterned metal layer includes a patterned base having at least a plurality of apertures, the patterned metal layer disposed on the patterned base, and a first surface finish layer. Parts of the lower surface of the patterned metal layer are exposed by the apertures of the patterned base to form a plurality of first contact pads for downward electrical connection externally, and parts of the upper surface of the patterned metal layer function as a plurality of second contact pads for upward electrical connection externally. The first surface finish layer is disposed at least on one or more surfaces of the second contact pads, and the first surface finish layer is wider than the second contact pad beneath. A package applied with the substrate disclosed herein further comprises at least a die conductively connected to the second contact pads of the substrate.
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This application claims the benefit of U.S. Provisional Application No. 61/177,652, filed May 13, 2009, the subject matter of which is incorporated herein by reference.
BACKGROUND OF THE INVENTION1. Field of the Invention
The invention relates in general to a substrate and a package and methods of manufacturing the same, and more particularly to the substrate having a single patterned metal layer, and a package applying the substrate, and methods of manufacturing the substrate and the package.
2. Description of the Related Art
The integrated circuit (IC) package technology plays an important role in the electronics industry. Electronic packaging is for protecting and supporting circuit configuration, creating a path for heat dissipation and providing modularized standard specification form factors for the parts. Electronic packaging in 1990s mainly employs ball grid array (BGA) packaging which is excellent in heat dissipation, has excellent electrical properties and is capable of increasing leads and effectively reducing the surface area of the package.
As lightweight, thinness, compactness, and high efficiency have become universal requirements of consumer electronic and communication products, the chip requires superior electrical properties, a smaller overall volume, and a larger number of I/O ports. As the number of I/O ports increases, the pitch of the integrated circuit is reduced. Thus, it is very difficult to achieve a high efficiency wiring on a BGA substrate or a lead frame substrate. For example, the density of I/O ports increases dramatically starting with the 0.18 μm IC node or high speed (such as 800 MHz above) IC design. Flip chip technology, having high I/O density and excellent electrical properties, is a solution to the above problem and has become one of the mainstreams in the development of electronic carriers. It is a main goal for the manufacturers to develop a substrate with higher density of I/O ports, smaller trace pitches and excellent electrical properties. Besides, in addition to the request of the flip chip technology, the request of systematic integration of the downstream products is also getting more and more urgent. Thus, the multi-chip module (MCM) process has an increased need of the MCM carrier. The MCM carrier and the flip chip carrier have great market potentia.
Along with the maturity in the chip scale packaging (CSP) technology, system in package SiP, the systematic semiconductor integration on a package level, which function-wise and cost-wise, has become a mainstream in packaging technology. As the product size becomes smaller and smaller and the function becomes more and more versatile, the SiP technology is used to satisfy the market demands. SiP technology integrates chips of different functions, passive components and other modules together, so that the electronic products have versatile functions. SiP technology also includes different technologies such as 2-dimensional multi-chip module packages and 3-dimensional stacked packages which stack chips of different functions for saving space. As for what type of packaging is most suitable for an application is determined according to the needs of the application. The SiP technology has a wide range of definition, and employs many types of bonding technologies such as wire bonding, flip chip bonding and hybrid-type bonding.
Take the SiP package for example. The SiP package integrates the dice of different digital or analogue functions and bonds the dice on a chip carrier by way of bump bonding or wire bonding. The carrier having embedded passive components or traces possesses electrical properties and is called the integrated substrate or the functional substrate.
For another type of integrated substrate, the through hole in the substrate could be filled with the conductive material such as copper by plating procedure, and the copper layers on two sides of the core are then patterned to form the metal trace.
Since the substrate depicted in
To satisfy the requirements of small-sized electronic products, it is a trend to develop a substrate structure with high density of I/O ports and small trace pitches without sacrificing the electrical properties. However, it is difficult to further reduce the size of the conventional structures (such as substrates of
The present invention provides structures of the substrate having a single patterned metal layer, and the package with this substrate, and methods of manufacturing the same. The substrate of the disclosure merely includes a patterned metal layer (as conductive traces) and a patterned base, which reduces the thickness of the substrate. This extra thin substrate is particularly suitable for the application of small-sized, low profile products. Also, the simplified process for manufacturing the substrate is suitable for mass production, while high production yield is still maintained. Compared to the prior art, the substrate structure of the disclosure satisfies the desired requirements of the electronic product with thin profile and low cost.
According to the first aspect of the invention, a substrate having a single patterned metal layer is provided, including a patterned base having at least a plurality of apertures, the patterned metal layer disposed on the patterned base, and a first surface finish layer. The patterned metal layer has an upper surface and a lower surface. Parts of the lower surface of the patterned metal layer are exposed by the apertures of the patterned base to form a plurality of first contact pads for downward electrical connection externally, and parts of the upper surface of the patterned metal layer function as a plurality of second contact pads for upward electrical connection externally. The first surface finish layer is disposed at least on one or more surfaces of the second contact pads, and the first surface finish layer is wider than the second contact pad beneath.
According to the second aspect of the invention, a package with the substrate having a single patterned metal layer is provided, comprising the substrate described in the first aspect, at least a die conductively connected to the second contact pads of the substrate, and a molding compound disposed on the patterned base so as to cover the patterned metal layer, the patterned base and the die.
According to the third aspect of the invention, a method of manufacturing a substrate having single patterned metal layer is disclosed. First, a patterned base having at least a plurality of apertures is provided. Then, a patterned metal layer is formed on the patterned base, and the patterned metal layer having an upper surface and a lower surface, wherein parts of the lower surface of the patterned metal layer are exposed by the apertures of the patterned base to form a plurality of first contact pads for externally conductive connection, and parts of the upper surface of the patterned metal layer function as a plurality of second contact pads for conductive connection upwardly. A surface finish layer is formed on the first contact pads. Next, a first surface finish layer is formed on one or more surfaces of the second contact pads, wherein the first surface finish layer is wider than the second contact pad beneath. The surface finishes may be the same in the case of a universal surface finish or different according to the needs of the type of interconnection.
Other objects, features, and advantages of the present invention will become apparent from the following detailed description of the preferred but non-limiting embodiment. The following description is made with reference to the accompanying drawings.
In the present invention, a substrate having a single patterned metal layer, and a package applied with the substrate, and methods of manufacturing the substrate and package are disclosed. The substrate of the disclosure mainly includes a patterned base and a patterned metal layer, wherein parts of the lower surface of the patterned metal layer are exposed by the apertures of the patterned base to form a plurality of first contact pads (such as ball pads) for electrical connection downwardly, and parts of the upper surface of the patterned metal layer function as a plurality of second contact pads (such as die bonding pads) for electrical connection upwardly. In an embodiment, a first surface finish layer is disposed at least on one or more surfaces of the second contact pads, and the first surface finish layer is wider than the second contact pad beneath. In an alternative embodiment, a first surface finish layer is disposed at least on one or more surfaces of the second contact pads while a second surface finish layer is disposed at the first contact pads, wherein the first surface finish layer of the second contact pad is wider than the second contact pad beneath as well as the first contact pad and the second finish layer. Alternatively, the first surface finish layer could be disposed on one or more surfaces and sidewalls of the second contact pads, such as covering the second contact pads. Further, a surface finish may cover all metal surfaces if convenient for the manufacturing process.
Compared to the prior art as depicted in
Several embodiments are provided to demonstrate the structures of substrate, and the package with the substrate, and methods of manufacturing the substrate and package. The methods of manufacturing the substrates would be slightly modified, without departing from the spirit of the invention, due to the different materials of the patterned base adopted in the embodiments. The first and second embodiments disclose manufacturing methods suitable for use of a copper clad laminate (CCL) with one layer of metal foil as the patterned base, and the third embodiment discloses manufacturing method suitable for use of a dielectric layer (ex: solder resist, bismaleimide triazine (BT), . . . , etc.) as the patterned base. However, the configurations of the substrates, material selections and the manufacturing processes described and illustrated in those embodiments are not intended to limit the invention. The modifications and variations can be made without departing from the spirit of the invention to meet the requirements of the practical applications.
Therefore, people skilled in the art would know that the structures and manufacturing methods presented in the embodiments and drawings could be slightly modified under the spirit of the invention. Also, it is also important to point out that the illustrations may not be necessarily be drawn to scale, and that there may be other embodiments of the present invention which are not specifically illustrated. Thus, the specification and the drawings are to be regard as an illustrative sense rather than a restrictive sense. Additionally, the drawings used for illustrating the embodiments and applications of the present invention only show the major characteristic parts in order to avoid obscuring the present invention.
First EmbodimentFirst, a base 201 is provided, and a metal layer 202 is formed on the base 201, as shown in
The base 201 can be formed of a variety of materials, such as resin or dielectric materials. Examples of resin materials of the base 201 include Ajinomoto build-up film (ABF), bismaleimide triazine (BT), polyimide (PI), liquid crystal polymer (LCP), epoxy, resin with a single copper foil, prepreg (PP), and other resin materials. The resins may be reinforced with glass fibers which can be woven or fiber mat or filled with a particulate filler. Alternatively, the base 201 may be formed of solder mask (SM), liquid crystal polymer (LCP), prepreg (PP), or other dielectric materials. It is not intended that the material of base 201 be limited to these illustrative compounds. In the first embodiment, the base 201 formed of resin material is exemplified for describing the progressive flow of manufacturing the substrate.
In an alternative embodiment, a copper clad laminate (CCL), originally including a core (resin reinforced with glass fiber) sandwiched between two metal foils, can be used as the base 201 and the metal layer 202 after one metal foil of the CCL has been removed as shown in
Next, the base 201 is patterned to form a patterned base 201′ with a plurality of apertures 201a or through holes 201b, as shown in
Subsequently, steps of forming a patterned metal layer 202′ and a surface finish proceeds. In the first embodiment, the first surface finish layers 204a and 204b are formed before patterning the metal layer 202. The metal layer 202 is patterned in accordance with the presence of the first surface finish layers 204a and 204b to form the patterned metal layer 202′.
Afterwards, a dry film is applied over the metal layer 202 and the finish layers 204a and 204b, exposed, developed and is etched according to the patterned dry film to form a patterned metal layer 202′, as shown in
Finally, the carrier 20 is removed and subjected to a treatment with organic solderability preservatives (OSP) to protect the copper surfaces from oxidation. This completes the fabrication of the substrate S1, as shown in
Although
Moreover, the substrate S1 of
Besides substrate S1 depicted in
According to the above descriptions, the substrates S1, S2 as shown in
Although
Besides substrates S1 and S2 of the first embodiment, the substrate structure can be varied by slightly modifying the methods described above without departing from the spirit of the invention. The features of the second embodiment identical to the features of the first embodiment are designated with the same reference numbers.
First, a base 201 is provided, and a metal layer 202 is formed on the base 201, as shown in
Next, the base 201 is patterned to form a patterned base 201′ with a plurality of apertures 201a or through holes 201b, as shown in
Subsequently, steps of forming the patterned metal layer 202′ and the first surface finish layers 205a and 205b proceed. In the second embodiment, the metal layer 202 is patterned before forming the first surface finish layers 205a and 205b.
A patterned photo-resist 203′ is formed on the metal layer 202, as shown in
Subsequently, a first surface finish layer 205a is formed on one or more surfaces and sidewalls of the second contact pads 2021 (i.e. the first surface finish layer 205a covers the second contact pads 2021), as shown in
Finally, the carrier 20 is removed to complete the fabrication of the substrate S3, as shown in
Moreover, the substrate S3 further includes a second surface finish layer 206 (as shown in
Please refer to the substrates S1 and S2, and substrate S3 depicted in
The substrates presented above could be applied to a wire-bonding type package or a flip-chip type package, and could be slightly modified to a pattern allows a fan-in type or fan-out type with package electrical connections.
Besides substrate S3 depicted in
According to the above descriptions, the substrate, such as the substrate S3 as shown in
The methods disclosed in the first and second embodiments adopt the substrates with the base 201 formed of resin material. In the third embodiment, the base 201 formed of dielectric material is exemplified for describing the progressive flow of manufacturing the substrate. Also, a carrier is adopted in the third embodiment during substrate fabrication.
First, a carrier 20 is provided. A metal layer 401 is formed on the carrier 20, and a base 402 is formed on the metal layer 401, as shown in
Next, the base 402 is patterned to form a patterned base 402′ with a plurality of apertures 402a and through holes 402b, as shown in
Subsequently, the metal layer 401 and the patterned base 402′ are removed from the carrier, and re-placed invertedly on the carrier 20, as shown in
A patterned dry film (not shown) is formed on the metal layer 401, and the metal layer 401 is etched according to the patterned dry film (as a mask) to form a patterned metal layer 401′, as shown in
Afterward, a first surface finish layer 404 is formed on one or more surfaces of the second contact pads 4011, as shown in
Finally, the carrier 20 is removed to complete the fabrication of the substrate S4, as shown in
Except the material selections of the bases 402 and 201, substrates S1 and S4 respectively shown in
Besides substrate S4 depicted in
Although
According to the above descriptions, the substrates S4, S5 as shown in
Although several types of substrates (S1-S5) and packages (P1-P2) have been illustrated with reference to specific embodiments, it is noted that the final structure of the substrate can be variable in accordance with requirements of the practical application. For example, materials and patterns of the base and metal layer would be varied from the illustration, depending to the specific requirements of the device. Also, the die could be wire bonded or flipped bonded to the substrate. Those skilled in the art will recognize that modifications and variations can be made without departing from the spirit of the invention.
The foregoing description and illustrations contained herein demonstrate many of the advantages associated with the present invention over the prior art. By providing substrate having two layers (patterned base and patterned metal layer), the thickness of the substrate is reduced to about 30 μm-130 μm giving rise to a lower profile package. This extra thin substrate is particularly suitable for the application of small-sized product. Also, the methods for manufacturing the substrates and packages disclosed in the foregoing embodiments are simple and suitable for mass production which has advantages of low cost and high yield of production. Compared to the prior art, the substrate structure of the disclosure satisfies the desired requirements of the electronic product with thin profile and low cost. Thus, the electronic product applied with the substrate of the present invention, especially for the small-sized and low-priced product, is very competitive in the commercial market.
While the invention has been described by way of example and in terms of the preferred embodiment, it is to be understood that the invention is not limited thereto. On the contrary, it is intended to cover various modifications and similar arrangements and procedures, and the scope of the appended claims therefore should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements and procedures.
Claims
1. A substrate having single patterned metal layer, comprising:
- a patterned base, having at least a plurality of apertures;
- a patterned metal layer, disposed on the patterned base, the patterned metal layer having an upper surface and a lower surface, wherein parts of the lower surface of the patterned metal layer are exposed by the apertures of the patterned base to form a plurality of first contact pads for downward electrical connection externally, and parts of the upper surface of the patterned metal layer function as a plurality of second contact pads for upward electrical connection externally; and
- a first surface finish layer, disposed at least on one or more surfaces of the second contact pads, wherein the first surface finish layer is wider than the second contact pad beneath.
2. The substrate according to claim 1, wherein the patterned metal layer comprises at least a die pad, which is a continuous metal body.
3. The substrate according to claim 2, wherein the first surface finish layer is further formed on the die pad and wider than the die pad beneath.
4. The substrate according to claim 1, wherein the first surface finish layer is disposed on one or more surfaces and sidewalls of the second contact pads.
5. The substrate according to claim 1, further comprising a second surface finish layer formed on one or more surfaces of the first contact pads.
6. The substrate according to claim 5, wherein the materials of the first and second surface finish layers are independently selected from the group consisting of Ni/Au, Ni/Ag, Au, Tin, Tin-lead alloy, silver, Ni/Pd/Au, organic solderability preservatives (OSP), and combination thereof.
7. The substrate according to claim 1, wherein the first contact pads for carrying out downward electrical connection are substantially under a die region or alternatively outside the die region to provide a conductive path to an external circuit.
8. The substrate according to claim 1, wherein the material of the patterned base comprises Ajinomoto Build-up Film (ABF), bismaleimide triazine (BT), polyimide (PI), liquid crystal polymer (LCP), epoxy, or resin with a single copper foil.
9. The substrate according to claim 1, wherein the patterned base is made of a dielectric material comprising solder mask (SM), liquid crystal polymer (LCP), or prepreg (PP).
10. The substrate according to claim 1, having a thickness ranged from about 30 μm to about 130 μm.
11. A package with substrate having single patterned metal layer, comprising:
- a substrate having a single patterned metal layer, comprising a patterned base having at least a plurality of apertures, the patterned metal layer disposed on the patterned base, and a first surface finish layer, the patterned metal layer having an upper surface and a lower surface, wherein parts of the lower surface of the patterned metal layer are exposed by the apertures of the patterned base to form a plurality of first contact pads for downward electrical connection externally, and parts of the upper surface of the patterned metal layer function as a plurality of second contact pads for upward electrical connection externally, the first surface finish layer disposed at least on one or more surfaces of the second contact pads, and the first surface finish layer is wider than the second contact pad beneath; and
- at least a die conductively connected to the second contact pads; and
- a molding compound, disposed on the patterned base so as to cover the patterned metal layer, the patterned base and the die.
12. The package according to claim 11, wherein the patterned metal layer comprises at least a die pad on which the die is mounted, and the die pad is configured as a continuous metal body.
13. The package according to claim 12, wherein the first surface finish layer is further formed on the die pad and wider than the die pad beneath.
14. The package according to claim 11, wherein the first surface finish layer is disposed on one or more surfaces and sidewalls of the second contact pads.
15. The package according to claim 11, further comprising a second surface finish layer formed on one or more surfaces of the first contact pads.
16. The package according to claim 15, wherein the materials of the first and second surface finish layers are independently selected from the group consisting of Ni/Au, Ni/Ag, Au, Tin, Tin-lead alloy, silver, Ni/Pd/Au, organic solderability preservatives (OSP), and combination thereof.
17. The package according to claim 11, wherein the material of the patterned base comprises Ajinomoto Build-up Film (ABF), bismaleimide triazine (BT), polyimide (P1), liquid crystal polymer (LCP), epoxy, or resin with a single copper foil.
18. The package according to claim 17, wherein an exposed area of a bottom surface of the patterned base by one of the apertures is larger than an exposed area of an upper surface of the patterned base by the aperture.
19. The package according to claim 11, wherein the patterned base is made of a dielectric material comprising solder mask (SM), liquid crystal polymer (LCP), or prepreg (PP).
20. The package according to claim 11, wherein the substrate has a thickness ranged from about 30 μm to about 130 μm.
21. The package according to claim 11, further comprising a plurality of bonding wires conductively connect an active surface of the die to the second contact pads.
22. The package according to claim 21, wherein the material of bonding wires is selected from the group consisting of gold, silver, copper, aluminum, and alloy thereof.
23. The package according to claim 11, wherein an active surface of the die is flipped connected to the second contact pads, and the first contact pads are subjected to a surface finish treatment.
24. The package according to claim 11, wherein the die and the patterned metal layer are at the same side of the patterned base, and the side of the molding compound is at least aligned with the side of the patterned base.
25. The package according to claim 11, wherein the first contact pads of the substrate for carrying out downward electrical connection are substantially under a die region or alternatively outside the die region to provide a conductive path between the package and an external printed circuit board (PCB).
26. The package according to claim 11, wherein a plurality of solder balls are attached to the first contact pads, or the first contact pads are filled with a conductive material, for conductively connecting the package to an external PCB.
27. A method of manufacturing a substrate having single patterned metal layer, the method comprising:
- providing a patterned base having at least a plurality of apertures;
- forming a patterned metal layer on the patterned base, and the patterned metal layer having an upper surface and a lower surface, wherein parts of the lower surface of the patterned metal layer are exposed by the apertures of the patterned base to form a plurality of first contact pads for externally conductive connection, and parts of the upper surface of the patterned metal layer function as a plurality of second contact pads for conductive connection upwardly; and
- forming a first surface finish layer on one or more surfaces of the second contact pads, wherein the first surface finish layer is wider than the second contact pad beneath.
28. The method according to claim 27, comprising:
- providing a base with a metal layer formed thereon;
- patterning the base to form the patterned base having the apertures;
- providing a carrier, and placing the patterned base on the carrier;
- patterning the metal layer to form the patterned metal layer;
- forming the first surface finish layer on one or more surfaces of the second contact pads; and
- removing the carrier.
29. The method according to claim 28, wherein the first surface finish layer is formed first, and the metal layer is then patterned according to the first surface finish layer to form the patterned metal layer, so as to define the second contact pads.
30. The method according to claim 27, comprising:
- providing a carrier with a metal layer formed thereon, and forming a base on the metal layer;
- patterning the base to form the patterned base having the apertures;
- removing the metal layer and the patterned base from the carrier, and re-placing the patterned base on the carrier;
- patterning the metal layer to form the patterned metal layer;
- forming the first surface finish layer on one or more surfaces of the second contact pads; and
- removing the carrier.
31. The method according to claim 27, wherein the patterned metal layer comprises at least a die pad, which is configured as a continuous metal body.
32. The method according to claim 31, further comprising forming the first surface finish layer on the die pad, wherein the first surface finish layer is wider than the die pad beneath.
33. The method according to claim 27, wherein the first surface finish layer is formed on one or more surfaces and sidewalls of the second contact pads.
34. The method according to claim 27, further comprising forming a second surface finish layer on one or more surfaces of the first contact pads.
35. The method according to claim 34, wherein the materials of the first and second surface finish layers are independently selected from the group consisting of Ni/Au, Ni/Ag, Au, Tin, Tin-lead alloy, silver, Ni/Pd/Au, organic solderability preservatives (OSP), and combination thereof.
36. The method according to claim 27, wherein the first contact pads for carrying out downward electrical connection are substantially formed under a die region or alternatively outside the die region to provide a conductive path to an external circuit.
37. The method according to claim 27, wherein the material of the patterned base comprises Ajinomoto Build-up Film (ABF), bismaleimide triazine (BT), polyimide (PI), liquid crystal polymer (LCP), epoxy, or resin with a single copper foil.
38. The method according to claim 27, wherein the apertures in the patterned base are formed by a laser drilling so that an exposed area of a bottom surface of the patterned base by one of the apertures is larger than an exposed area of an upper surface of the patterned base by the aperture.
39. The method according to claim 27, wherein the patterned base is made of a dielectric material comprising solder mask (SM), liquid crystal polymer (LCP), or prepreg (PP).
40. The method according to claim 27, wherein the substrate has a thickness ranged from about 30 μm to about 130 μm.
Type: Application
Filed: Sep 18, 2009
Publication Date: Nov 18, 2010
Patent Grant number: 8399776
Applicant: ADVANCED SEMICONDUCTOR ENGINEERING, INC. (Kaohsiung)
Inventors: Bernd Karl APPELT (Gulf Breeze, FL), William T. CHEN (Endicott, NY), Calvin CHEUNG (San Jose, CA), Shih-Fu HUANG (Hsinchu County), Yuan-Chang SU (Taoyuan County), Chia-Cheng CHEN (Zhongli City), Ta-Chun LEE (Taipei City)
Application Number: 12/562,950
International Classification: H05K 1/18 (20060101); H05K 1/03 (20060101); H05K 1/02 (20060101); B05D 5/12 (20060101); B05D 3/06 (20060101);